Next Flashcards
(16 cards)
What is the nature of diseases that are constantly present in a locality but assume severe forms only on occasions?
These diseases occur due to favorable environmental conditions responsible for their rapid development.
Examples include wheat stem rust (Puccinia graminis tritici) and powdery mildew (Erysiphe graminis var. tritici).
What is an endemic disease?
An endemic disease is one that is consistently present in a specific area.
For example, citrus canker is endemic in Asia.
What is an epidemic disease?
An epidemic disease is one that becomes widespread in a particular area.
For example, citrus canker is epidemic in Florida (U.S.A).
What is a pandemic disease?
A pandemic disease is an epidemic that spreads over continents or subcontinents and involves mass destruction.
The outbreak of black stem rust of wheat in India during 1947 is an example.
What are sporadic diseases?
Sporadic diseases occur at irregular intervals over limited areas or locations.
Examples include Fusarium wilt of cotton and grain smut of sorghum.
How are diseases classified based on the nature of dispersal medium?
Diseases can be classified as soil-borne, seed-borne, or wind-borne diseases.
What are the classifications of plant diseases based on parts of the host affected?
The classifications include foliage disease, stem disease, boot disease, and vascular disease.
What is the classification of plant diseases based on hosts affected?
This classification is a matter of convenience and does not involve a fundamental principle.
What is the nature of diseases that are constantly present in a locality but assume severe forms only on occasions?
These diseases occur due to favorable environmental conditions responsible for their rapid development.
Examples include wheat stem rust (Puccinia graminis tritici) and powdery mildew (Erysiphe graminis var. tritici).
What is an endemic disease?
An endemic disease is one that is consistently present in a specific area.
For example, citrus canker is endemic in Asia.
What is an epidemic disease?
An epidemic disease is one that becomes widespread in a particular area.
For example, citrus canker is epidemic in Florida (U.S.A).
What is a pandemic disease?
A pandemic disease is an epidemic that spreads over continents or subcontinents and involves mass destruction.
The outbreak of black stem rust of wheat in India during 1947 is an example.
What are sporadic diseases?
Sporadic diseases occur at irregular intervals over limited areas or locations.
Examples include Fusarium wilt of cotton and grain smut of sorghum.
How are diseases classified based on the nature of dispersal medium?
Diseases can be classified as soil-borne, seed-borne, or wind-borne diseases.
What are the classifications of plant diseases based on parts of the host affected?
The classifications include foliage disease, stem disease, boot disease, and vascular disease.
What is the classification of plant diseases based on hosts affected?
This classification is a matter of convenience and does not involve a fundamental principle.
